[PATCH 2/5] drm/amdgpu: use explicit limit for VRAM_LINEAR handling

["Christian König" <deathsimple-ANTagKRnAhcb1SvskN2V4Q@public.gmane.org>]

From: Christian König <christian.koenig@amd.com>

Split VRAM won't have a valid offset, so just set an explicit limit
when the flag is given to trigger reallocation if necessary.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 6f83909..79f6413 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -123,12 +123,17 @@ static void amdgpu_ttm_placement_init(struct amdgpu_device *adev,
 
 	if (domain & AMDGPU_GEM_DOMAIN_VRAM) {
 		unsigned visible_pfn = adev->mc.visible_vram_size >> PAGE_SHIFT;
+		unsigned lpfn = 0;
+
+		/* This forces a reallocation if the flag wasn't set before */
+		if (flags & AMDGPU_GEM_CREATE_VRAM_LINEAR)
+			lpfn = adev->mc.real_vram_size >> PAGE_SHIFT;
 
 		if (flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS &&
 		    !(flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
 		    adev->mc.visible_vram_size < adev->mc.real_vram_size) {
 			places[c].fpfn = visible_pfn;
-			places[c].lpfn = 0;
+			places[c].lpfn = lpfn;
 			places[c].flags = TTM_PL_FLAG_WC |
 				TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM |
 				TTM_PL_FLAG_TOPDOWN;
@@ -136,7 +141,7 @@ static void amdgpu_ttm_placement_init(struct amdgpu_device *adev,
 		}
 
 		places[c].fpfn = 0;
-		places[c].lpfn = 0;
+		places[c].lpfn = lpfn;
 		places[c].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
 			TTM_PL_FLAG_VRAM;
 		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)
-- 
2.5.0

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